Hi! I have installed on mi4c. Facing problems with gps. Looks like os cant find it at all.

Try to install Satstat

I did. Shows nothing.
You use gapps? Or microg?

I should thing a goal is to DE-Google®, other than for testing.

As far as blindly trying app's, IDK, maybe, just to see if the hardware can be reached:

GPSTest (An app for testing GPS and GNSS capabilities of a device) - https://f-droid.org/app/com.android.gpstest.osmdroid

Location really should have a finer-grain control, i.e. per-app', or momentary/one-time permission,inclusive of normally being piped via one of the fake-location app's.

Choosing with whom, and when, to share your location, should be a right, excercised under the concept of "right to repair" or modify. SBCs (Single Board Computers) with Baseband Isolation and hardware deselection/powering-down of radio transceivers and geolocation receivers, could help.

In reply to@venant:matrix.org
basic question... is location turned on?

It should be inferred from above, that in a true emergency, most might want to transmit their current geolocation coordinates, if they intended to summon help to their current location. But normally many of us want that info' undisclosed. A parch to do that in LineageOS, and maybe merged/pulled into AOSP, would be nice.

¯\_(ツ)_/¯